59.51+39.175x^0.2=100-5x
    119.0394+78.35x^0.2=100-5x
    7.835x^0.2=20-x
    (x+1)x=208
    x=0
    x+sinx＝0
    x^4-3*x^2+3*x=0
    8.767842365x*x+5903.560197x-760^2=0
    8.767842365x^2+5903.560197x-760^2=0
    -5.77980*x^0.2=2-x
    -5.78*x^0.2=2-x
    180.9*7.24*x*(760+x)+4*(x*203/2)*x/2-4*(760*203/2)*760/2=0
    180.9*7.24*x*x+4*(x/(760+x)*203/2)*x/2-4*(760/(760+x)*203/2)*760/2=0
    180.9*7.24*x+4*(x/(760+x)*203/2)*x/2-4*(760/(760+x)*203/2)*760/2=0
    180.9*7.24*x^2/(x+1)=1
    180.9*7.24*x=1
    sqrt(2)（1-x)=sqrt(1+x*x)
    x^4-3*x^2+2*x=0
    79/x=6/40
    2.5*1.845/(1+0.013033)^2.5+3*1.845/(1+0.013033)^3+3.5*1.845/(1+0.013033)^3.5+4*(100+1.845)/(1+0.013033)^4

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